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    Potterton Suprima 60 - Hot Water won't go off

    I have a Potterton Suprima 60, whose hot water will not turn off. The heating works (ie goes on and off). The boiler has a constant green flashing light and fires up every 5 to 10 mins. The only way to turn off is by the mains. I am concerned that it may blow the whole system if I leave it on...
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